Hello World (NodeJS)
This guide walks you through the most simple way to get data on to the permaweb using arweave-js and irys.
With Arweave 2.6 only allowing 1000 items per block, directly posting to the gateway (eg. using arweave-js) will likely be uncommon.
Requirements
- NodeJS LTS or greater
Description
Using a terminal/console window create a new folder called hw-nodejs.
Setup
cd hw-nodejs
npm init -y
npm install arweave @irys/sdk
Generate a wallet
node -e "require('arweave').init({}).wallets.generate().then(JSON.stringify).then(console.log.bind(console))" > wallet.json
Upload using Irys (Previously Bundlr)
Uploads of less than 100 KiB are currently free on Irys' Node 2.
import Irys from "@irys/sdk";
import fs from "fs";
const jwk = JSON.parse(fs.readFileSync("wallet.json").toString());
const url = "https://node2.irys.xyz";
const token = "arweave";
const irys = new Irys({
url, // URL of the node you want to connect to
token, // Token used for payment and signing
jwk, // Arweave wallet
});
const dataToUpload = "GM world.";
try {
const receipt = await irys.upload(dataToUpload);
console.log(`Data uploaded ==> https://arweave.net/${receipt.id}`);
} catch (e) {
console.log("Error uploading data ", e);
}
Upload using ArweaveJS
If you are running the latest version of nodejs this arweavejs script will work as is. For other versions you may need to use the --experimental-fetch flag.
import Arweave from "arweave";
import fs from "fs";
// load the JWK wallet key file from disk
const jwk = JSON.parse(fs.readFileSync('./wallet.json').toString());
// initialize arweave
const arweave = Arweave.init({
host: "arweave.net",
port: 443,
protocol: "https",
});
const tx = await arweave.createTransaction(
{
data: "Hello world!",
},
jwk
);
await arweave.transactions.sign(tx, jwk);
arweave.transactions.post(tx).then(console.log).catch(console.log);
console.log(`https://arweave.net/${tx.id}`);